Zygarde help

The zygarde cells do not show up and I cant collect them even though I have the cube

Would you please give a bit more info?

I have the Zygarde cube but the cells do not show up in the overworld and if I try to interact with where they should be nothing happens

Make sure to go pay a visit to the Zygarde in Terminus Cave first, it should be accessible by using Heart Swap in the Naragex Forest section of the Void Gauntlet.